钢纤维对超高性能混凝土干燥收缩的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.023.007

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Abstract This paper reports the study of the influence of steel fibers on drying shrinkage of ultra-high performance concrete (UHPC) at fiber volume content of 0%, 1%, 2% and 3%, temperature of (20 ± 2) ℃ and relative humidity of (50±5)%. The results showed that during the first 7 days, the drying shrinkage rate of UHPC was very fast, while after 7 days it gradually decreased. The interfacial bonding of steel fiber and the physical properties of steel fiber can effectively reduce the drying shrinkage. However, when the steel fiber exceeds an optimal volume, the effect of steel fiber on drying shrinkage can decrease. Compared with the steel fiber content at 2%, the drying shrinkage of the UHPC with 3% steel fiber was decreased by only 1.5%. The reason is that the increase in the steel fiber leads to an increase in the interface layer, the interface transition zone is usually more porous than the matrix, which easily leads to shrinkage, and consequently reducing the beneficial effect of steel fiber on drying shrinkage control. It was also found that the inhibition of fly ash on the drying shrinkage of UHPC was higher than slag. The experiment also tested the classic dry shrinkage models: the ACI model and the Wang Tiemeng model. Based on the two models and the experimental fitting, a new mathematical model (a combined index model) has been proposed. The results showed that the combined index model fitted better than the two models mentioned above.

Key words： ultra-high performance concrete (UHPC) steel fiber fly ash slag drying shrinkage mathematical model fitting

Published: 10 December 2017 Online: 2018-05-08

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TU528

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	Articles by authors
	WU Linmei
	SHI Caijun
	ZHANG Zuhua
	WANG Hao

Cite this article:

WU Linmei,SHI Caijun,ZHANG Zuhua, et al. Effects of Steel Fiber on Drying Shrinkage of Ultra High Performance Concrete[J]. Materials Reports, 2017, 31(23): 58-65.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.023.007 OR https://www.mater-rep.com/EN/Y2017/V31/I23/58

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